KROHNE OPTISENS OAS 2000 EN - Manual (Page 32)

5
OPERATION
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OPTISENS OAS 2000
www.krohne.com 07/2010 - MA OAS 2000 R02 en
5.3.3 Calibration screen
The sensor information menu is the calibration curve screen. To change between the main menu
and the calibration screen, press ↓ and ^ simultaneously.
The converter uses at least a zero sample and one sample (single point calibration). Up to five
samples may be used to create a calibration curve (multipoint calibration).
The calibration menu displays sample values placed in a graph.
• The X-scale displays consistency/suspended solids, where min min min min value (4 mA output) is shown
on the left and max max max max value (20 mA output) is shown on the right.
• The Y-scale displays the light loss due to solids from the sensor light source. The converter
uses the light loss values to calculate which measuring signal corresponds to min-
consistency/suspended solids and max-consistency/suspended solids.
• The actual measuring value is indicated with an arrow that moves up and down to the left of
the Y-scale axis.
• Samples that are not within the chosen scale of the active sensor are not displayed on the
calibration screen. However, these samples are still used in the calculations. If you want to
see a point outside the sensor scale, then you may temporarily change the scale in the sensor
menu Scale/Alarm.
Scale/Alarm. Scale/Alarm. Scale/Alarm.
If the sample values are switched or the lab result is incorrectly performed, then the calibration
curve will be incorrect. Such a mistake is easy to discover on the calibration screen since a part
of the calibration curve will go in the wrong direction. Different measuring values should never
correspond to the same consistency/suspended solids.
INFORMATION!
The sample number itself does not change, only the order in which the samples are used.
Figure 5-2: Calibration screen
1 Single point calibration
2 Multi point calibration
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